A defining characteristic of ribbon worms is the presence of a proboscis -- a unique muscular structure inside the worm’s body. When attacking prey, they compress their bodies to push out the proboscis like the finger of a latex glove turned inside-out.

Ribbon worms can be long, too, with reports of them stretching out to an astonishing 98 feet. They also have the ability to ingest animals that are more than twice as wide as they are.

So, if you ever do come across one in person, be prepared to see some amazing things.